Sheet-attaching device for stencil-machines.



E. A. COX.

SHEET ATTAUHING DEVICE I OR STENCIL MACHINES= APPLICATION FILED MAY 22,1912.

Patented Aug. 11, 1914,

' UNITEDJSTATES FATE EDWIN A. cox, or DAYTON, OHIO, AssIenoR T0 ,TrrE.no'rosrEEn COMPANY, or: DAYTON, OHIO, aconromrzon or OHIO.

sm'r-Ar'racrtme DEVICE ron STENCIL-MACHINES.

Specification of Letters Patent. Application filed May 22, 1912; SerialNo. 699,025.

Patented Aug. 11, 1914.

A. Cox, a Britain, re

vice for attaching 'an ink pad and stencil sheetto a stencil printingmachine and particularly to the rotary cylinder ty e cominonly known asduplicating machines of the class set forth in my Patent No. 1,07 0,419of August 19th, 1913, and in 'my'pending application, No. 537,440, filedJany. 11th, 1910. In this. class of'machines, the ink pad and Waxedstencil sheet are wrapped around and upon a. perforated stencilsupporting segment having the ends thereof provided with means forattaching the ends of the ink pad and stencil sheet. The ends of the inkpads, which are usually made of woven fabric such as cotton flannel orequivalent material capable of readily absorbing and distributing theink, are preferably bound with thin sheet metal reinforcements havingmeans for attachment to cooperative attaching devices on the ends of thestencil supporting segment so as to draw the pad smoothly across thesurface of said. segment. In like manner, suitable means must beprovided for attaching at least one end of the stencil sheet to thefront end of the segment soas to hold it smoothly upon the surface ofthe pad during the operation of printing.

So far as I am aware in all the-methods of attachment of the pad andstencil sheet heretofore employed, considerable difliculty has beenexperienced not only in properly alining these elements upon t e segmentso as to draw evenly and smoothly over the surface thereof but there hasalways been more or less trouble and delay caused by tearing out theends of the stencil due partially to the strain thereon and partially tothe fact that it is drawn over the metal binding on the pad.

The main object of my present invention is to obviate these difiicultiesby providing the front ends of the stencil supporting segment with adetachableattaching plate havng a series ofparallel rows of forwardlyinclined catches or fingers, those of one row being less in number thanand arranged in staggered relation with those of the other row, the rowhaving the lesser number of fingers being adapted to enter thecorrespondingly arranged apertures or slots in the binding strip on oneend of the pad, while the fingers of both rows are adapted to entercorrespondingly disposed apertures in the end of the waxed stencil sheetso as to distribute the strain upon said sheet more evenly along the endthereof.

Another object is to. depress the portion of the attaching plate towhich the binding strip of the pad is attached slightly beneath thesurface of the'remaining portion of the plate upon-which the end of thestencil rests so that when the stencil and pad are placed -in operativeposition, the stencil will be drawn smoothly over the surface of thebinding strip of the pad. In other words I have sought to utilize arelatively small number of fingers for attachment to the binding stripof the pad and a relatively larger number of fingers for retaining thestencil sheet and at the same time to, avoid any sharp bends between theattaching end I of the stencil sheet and plate or pad.

Other objects and uses will be brought out in the following description.

In the drawingsFigure 1 is a perspec tive view of the attaching plateshowing the inking pad and stencil sheet attached thereto. Fig- 2 is aperspective view of the same plate showing the adjacent: end of theinking pad attached thereto, thestencil sheet being removed. Fig. 8 is aperspective view' of the detached stencil attaching plate. Fig. 4 is asectional view taken on line 4-4 Fig. 1. Fig. 5 is a perspective view ofthe attaching end of the'detached stencilsheet showing the perforationstherein as corresponding in position to the-fingers on the" plate. Fig.6 is a perspective view of one end of the inking pad showing moreparticularly the binding strips and perforations therein. v

The attaching means for the ink pad and stencil preferabl comprises asheet metal plate -1- angu at in cross section forming lengthwiseflanges -2. and -3 preferably disposed at an acute angle with each.

other as shown more clearly in Fig. 4-, the

, within the extended periphery of the segment to avoid contact with theimpression roll as the segment is rotated in the operation of printing.Theflange 2 which, as previously stated, is somewhat wider thantheflange 3 is stepped to form bearing surfaces 7- and 8-in differentparallel planes, the bearing -7 which is adjacent the flange -3 beingdepressed beneath the bearing 8 and 1s provided with a series of, inthis instance three, upwardly and forwardly projecting fingers or prongs9 spaced uniform distances apart and adapted to enter correspondinglydisposed slots or apertures --10 in a sheet metal binding strip 11- withwhich the ends of the inking pad as -12- are provided, thus permittingeither end of the pad to be attached to the prongs -9-. In like mannerthe raised bearing -8 is provided with a series of, in this instancesix, upwardly and forwardly inclined prongs or fingers --13. spaceduniform distances apart for entering similarly disposed apertures 14 inone end of a'stencll sheet as 15-, said stencil sheet being providedwith an additional series or row of, in this instance three, apertures16- disposed to correspond with and for'receiving the prongs or fingers-9-.

It is apparent from the foregoing description-that the plate --1 isprovided with two parallel rows of prongs or fingers, those on the lowerbearing 7 being less in number and staggered with those of the other rowon the bearing 8. The stencil sheet 15- is also provided near one endwith parallel rows of apertures 14: and'16 corresponding in position tothe ositions of the prongs 13- and -9.'

he binding strip -11 of the inking pad, however, is only provided With asingle row of three apertures -10- disposed to receive only the prongs9-.

The bearing 7-- is disposed beneath the bearing -.8- a distancecorresponding approximately to the thickness of the binding strip 11- sothat when the latter is placed upon the bearing -7 in o erativeconnection with the prongs -9,1ts outer surface will be substantiallyco-incident with the corresponding surface of the bearing 8. Ittherefore follows that when the stencil sheet is placed in operativeconnection, with the plate -1- with the prongs -9 and 13- projectingrespectively through the apertures 16- and 14, said stencil sheet willnot only lie smoothly across the binding stri and upon the pad but willalso be attac ed at a relatively large number of points throughout itswidth and at different distances from its end edge so as to properlyaline the stencil on the segment and also reduce the liability oftearing out while smoothing it out upon the pad. The prongs 9- and 13are struck up and entirely detached at their front ends from the flange2 of the plate -,-1 leaving their rear ends united integrally to saidflange so that the prongs are disposed at an angle to the planes of thebearings 7 and 8- with their free ends projecting forwardly in thedirection of rotation of the stencil supporting drum, therebyfacilitating the retention of the pad and stencil sheet in engagementwith the prongs during the printing operation and at the same timepermitting said pad and stencil sheet. to be easily and quickly attachedto or detached from the plate. When the plate -1:- is secured in themanner described to the end of thestencil supporting segment or drum itbecomes practically a part of said drum or an extension of oneendthereof deflected inwardly within its periphery.

What I claim is-:

1. In a stencil printing machine, in combination with a stencilsupporting segment, a an angle plate havin one of its flanges secured toone ,end 0 the segment and its (other flange provided with forwardlyprojecting prongs, an ink pad detachably engaged with some of'theprongs, and a stencil sheet having apertures positioned to correspondwith the position of all the prongs and attached tofall of saidprongs.

2. In a'stencil printing machine, the combination, with a stencilsupporting segment, a of a plate attached to the segment and having aportion arranged within the circumference of a circle described on the.radius of said segment, said portion of said plate havin outwardlyprqecting prongs, an ink pad swing a portion providedwith apertures toreceive said prongsto attach lthe pad to the plate, said plate having asecond series of prongs arranged in advance 2 of the first series, and astencil sheet adapted 'gto extend across the apertured portion of 4 saidink pad andhaving apertures to receive the prongs of said second series.

3. In a stencil printing machine,rthe combination, with a stencilsupporting segment, of a plate attached to and extending in front ofsaid segment, said plate having two series of outwardly projectingprongs, an ink pad and a stencil sheet mounted in superposed relation onsaid segment, said ink pad having apertures to receive the prongs of'one series and said stencilsheet having apertures to receive the prongsof the other series.

4. An attaching 'plate for ink pads and stencil sheets of a stencilprinting machine, said plate having stepped bearings, and separate rowsof prongs inclining from their respective bearings in. the direction ofmovement of the plate,

5. In a stencilprinting machine, a stencil supporting segment having anextension at one end thereof, said extension being provided with abearing surface and with prongs projecting outwardly between the frontand rear edges of said bearing surface and inclined in the direction ofrotation, and a flexible sheet supported by said segment and having apart engaging said hearing surface and provided with apertures throughwhich said prongs project.

6. In a stencil printing machine, a stencil supporting drum segmenthaving an in wardly deflected extension at one end provided. with;separate rows of prongs struck up outwardly in -planes one in advance ofthe other,a pad'having one end provided 1 with apertures receiving theprongs of one row, and a stencil sheet having one end pro- .videdwvithseparate sets of apertures receiving both rows of prongs.

7. In a stencil printing machine, the combination, with a stencilsupporting segment having a flange at the forward end thereof, of anattaching plate connected to said flange and provided with a bearingsurface disposed within the circular path of said segment, and means tosecure the end of a stencil sheet to said plate.

8. In a stencil printing machine, the com-* bination, with astencil-supporting segment Y having a flange extending inwardly from oneend thereof, of a stenc l attaching plate connected to said flange anddisposed wholly within the circle described by 'said segment.

9. In a stencil printing machine, the combination, with astencil-supporting segment having a flange extending inwardly from oneendthereof,-of a plate bent to form longitudinal flanges, one of saidflanges being arranged in engagement with and attached to the flange ofthe segment and the other flange of said plate projecting forward fromsaid segment and having stencil attaching means.

10. In a stencil printing machine, the combination with a stencilsupporting segment, of a flange extending inwardly from one end thereof,and a plate bent to form longitudinal flanges arranged at an angle toeach other, one of said flanges of the plate being attached totheflange' of the segment, and the other flange of said plate beingformed with stencil-sheet attaching means.

11. In a stencil printing machine, the combination with a stencilsupporting segment, of a flange extending inwardl from one end thereof,and a plate connecte to said flange and formed with separate rows ofprongs, one of said rows of prongs being adapted for engagement with anink pad, and both of said rows of prongs being adapted for en'- gagementwith a stencil sheet.

12. An attaching plate for ink pads and stencil sheets of a stencilprinting machine, said plate bein bent longitudinally to form flanges,one 0% said flanges being formed with separate means for attaching bothan ink pad and a stencil sheet thereto.

In witness whereof I have hereunto set my hand this 14th day of May1912.

EDWIN A. COX.

Witnesses":

GEORGE B. LEWIS, Amos L. KEEMER.

